static long First(string inputFile)
{
var lines = new LineParser().ReadData(inputFile);
var errorScore = 0L;
foreach (var line in lines)
{
var stack = new Stack <char>();
foreach (var c in line)
{
if (ChunkPairs.IsOpenCharacter(c))
{
stack.Push(c);
}
if (ChunkPairs.IsCloseCharacter(c))
{
var pair = ChunkPairs.FindByCloseCharacter(c);
if (stack.Peek() != pair.OpenCharacter)
{
//syntax error
errorScore += pair.SyntaxErrorScore;
break;
}
stack.Pop();
}
}
}
return(errorScore);
}
static long Second(string inputFile)
{
var lines = new LineParser().ReadData(inputFile);
//var errorLines = new List<string>();
var completionScores = new List <long>();
foreach (var line in lines)
{
var completionScore = 0L;
var stack = new Stack <char>();
var syntaxError = false;
foreach (var c in line)
{
if (ChunkPairs.IsOpenCharacter(c))
{
stack.Push(c);
}
if (ChunkPairs.IsCloseCharacter(c))
{
var pair = ChunkPairs.FindByCloseCharacter(c);
if (stack.Peek() != pair.OpenCharacter)
{
//syntax error
syntaxError = true;
break;
}
stack.Pop();
}
}
while (!syntaxError && stack.Count > 0)
{
var charToClose = stack.Pop();
var pair = ChunkPairs.FindByOpenCharacter(charToClose);
completionScore *= 5;
completionScore += pair.CompletionScore;
}
if (completionScore > 0)
{
completionScores.Add(completionScore);
}
}
return(completionScores.OrderBy(l => l).ElementAt(completionScores.Count / 2));
}